If the market supply curve for a product shifts rightwards, what is the best possible explanation for this shift?

Q. If the market supply curve for a product shifts rightwards, what is the best possible explanation for this shift?

• Increase in the price of raw materials
• Introduction of a tax on that product by the government
• Introduction of a new technique that makes the production of that commodity cheaper
• An advertising campaign that is successful in promoting the product

Answer: Introduction of a new technique that makes the production of that commodity cheaper